Which river rises in peru, enters the sea in brazil and at no point is crossed by a bridge

Which of the following areas have the highest population density? a) quebecb) united statesc) californiad) new york city

In 1933 the 21st amendment was added to the u.s. constitution, allowing for the manfacture, transportation, and sale of alacoholic beverages in the united states. why was this amendment needed?

Computer models can scientists predict weather. some computer models can show the predicted path of hurricanes. what other events could a computer model warn us of? a) undersea earthquakes , tornadoes, and avalanches b) tornadoes c) avalanches d) undersea earthquakes